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Posted by ~P~ on 04/14/06 04:27
Thanks for the link Jeff... It confirms exactly what I said...
From YOUR link:
"This is called 2-3 pulldown" (note, later in the site they say this is also
called 3:2)
and (from section 3.4)
"In the case of 24 fps source, the encoder embeds MPEG-2 repeat_first_field
flags into the video stream to make the decoder either perform 2-3 pulldown
for 60Hz NTSC displays (actually 59.94Hz) or 2-2 pulldown (with resulting 4%
speedup) for 50Hz PAL/SECAM displays. In other words, the player doesn't
"know" what the encoded rate is, it simply follows the MPEG-2 encoder's
instructions to produce the predetermined display rate of 25 fps or 29.97
fps. This is one of the main reasons there are two kinds of discs, one for
NTSC and one for PAL."
I don't know why you call 480i/24 - psuedo 24 frame encoding. Or why you
say there is no 3:2 work performed. The interlaced fields ARE already on
the disc - that's what the 'i' in 480i/24 stands for. The repeat field, is
of course there because it IS 24fps material encoded on the disc. This is
exactly what I said, and is fully supported by the link you provided.
I have pretty much read that FAQ, and others, from top to bottom to get as
much information as I can. I simply don't understand the need for your to
argue the statement. Makes me wonder how many other times you tell people
they are wrong when they aren't.... should make others wonder as well.
~P~
"Jeff Rife" <wevsr@nabs.net> wrote in message
news:MPG.1ea683e3f979e78b98a461@news.nabs.net...
Jeff Rife (wevsr@nabs.net) wrote in alt.tv.tech.hdtv:
> ~P~ (bmxtrix2005@cox.net) wrote in alt.tv.tech.hdtv:
> > Nope, they encode DVDs with 480i/24 data from movies and DVD players
> > must
> > perform the 3:2 work to get 480i/60 or 480p/60 out of the video.
>
> Wrong, wrong, wrong. There is no "3:2 work" done by the player to
> convert the pseudo-24 frame encoding to 60i. The actual encoding on
> disc already has interlaced fields encoded along with "repeat field"
> flags, and the player just follows this to create the 30fps interlaced
> output.
See http://www.dvddemystified.com/dvdfaq.html#3.8 for complete details.
The MPEG-2 stream has "29.97 fps, interlaced" encoded into the header.
It is illegal to have "24 fps, interlaced" in the header of an MPEG-2
stream authored onto a DVD.
--
Jeff Rife |
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